Soluble color compound.



I UNITED STATES PATENT OFFICE.

WILLIAM BEOKERS AND ISAAC DBEYFUS, OF BROOKLYN, NEW YORK, ASSIGNORS TO W. BECKEBS ANILINE &; CHEMICAL WORKS, INC., A CORPORATION OF NEW YORK.

SOLUBLE COLOR COMPOUND.

1,228,089. "No Drawing.

To all whom it may concern:

Be it known that we, WILLIAM Backers,

a doctor of philosophy, and ISAAC DRnYr'Us,

a doctor of philosophy, both citizens of the United States, and residents of the borough of Brooklyn, in the'county of Kings, city and State of New York, have invented certain'new and useful Improvements in Soluble Color Compounds, of which the following is a specification.

The object of our invention is a method for the production of new, novel and useful chromium compounds of mordant colors and the results produced thereby.

The usefulness of the mordant colors in dyeing depends upon the formation of a compound with an alkali metal in or upoh the textile fiber. As these compounds are insoluble, considerable difiiculty is experienced incausing them to thoroughly penetrate the fiber or to be so afiixed to the surfaceof the fiber as not to rub off.

If a solution of a chromium compound is mixed with a solution of a mordant color such as logwood, alizarin blue pastes, etc), at the boil, that is, under the conditions of practical dyeing, a heavy insoluble precipitate of the chromium compound of the mordant color is at once formed. This lake has no dyeing properties and its presence in the dye bath is very objectionable as it aflixes itself to the exterior of the fiber,

causing rubbing or smutting when the goods are dried. As the formation of this compound is necessary in the dyeing of the color it is evident that it must not be formed in the dyeing solution but in or uponthe fiber itself.

The method usually employed in the use of these mordant colors is to treat the fiber first with either a solution of-a lake forming' compound, such as potassium bichromate and then with a solution of the mordant color, or, to reverse the steps, treating the fiber first with a solution of the mordant color and thenlwith thelake forming compound solution, the operations being conducted in the'presence of a reducing the various operations required have a tendency to weaken and harden the fiber.

Patented May 29, 1917.

Application filed July 6, 1914. Serial No. 849,116.

The ideal method of dyeing these mordant colors upon textile fibers would be the production of their chromium compounds in a condition in which it is perfectly soluble in the dye bath, the thorough penetration of the fiber with this solution, and the precipitation of the lake Within the fiber. Such a method would reduce the number of steps in the dyeing operation and therefore reduce the possibility of ten- 'mordant color be added to a solution of the chromium compound formed by heating glucose and certain chromium salts, for example, the neutral chromates of the alkalimetals, there results a chromium compound of the color which. is perfectly soluble in water, or in water containing an alkali or acid, even at the boiling temperature.

When a textile fiber, for example, wool,

is introduced into this solution it can be" the chromium compound thus formed, add

a solution of 2100\pounds alizarin blue 20% paste in suflicient water, with constant stirring. The resulting clear solution of the chromium compound of the alizarin blue may be used directly in the dye bath .with the addition of the proper dyeing ingredients,"s'uch as acetic acid or sulfuric acid.

This above mentioned solution of the chromium compound of the alizarin blue may be evaporated to dryness, in which case it is advisable to add a small amount of an alkaline compound to render the solution alkaline. The dry color compound thus produced is soluble in water and may be employed in the same manner as the original solution before evaporation.

We do not limit ourselves to the particular ingredients, the quantities, times or temperatures mentioned above, nor to the particular order of the incorporation of the ingredients, all of which may be varied without going beyond the scope of our invention as described and claimed.

What is claimed, is:

1. The process of producing a com ound of a mordant color soluble in water, al aline water and acidulated water which comprises dissolving'a neutral chromium alkali-metal compound in glucose, heating until no chromic acid is shown by testing with potassium iodid, and adding a solution of a mordant color.

2. The process of producing a compound of a mordant colorsoluble in 'water, akaline water and acidulated water which comprises dissolvin a neutral. chroma'te of sodium in glucose, eatinguntil no chromic. acid is shown by testing with potassium iodid, and adding a solution of a mordant color.

e process "of dissolving ;a neutral chromate of an alkali-metal compound inglucose, heating until there is no .chromic I acid present, and adding a solution of a mordant color.

4. The process of dissolving neutral chromate of sodium in glucose, heating until there is no chromic acid present, and adding. a solution of a mordant color.

5. The process of roducing a com ound of a mordant color so uble in water, al aline water and acidulated water comprising heatmg glucose and a chromiumcompound together in solution producing a solution of a chromium com ound not precipitatable by alkalis or mor ant colors, and adding the solution of a mordant color. I

6. The recess ofproducing a compound of a mord line water and acidulated water comprising heating glucose. and neutral chromate of an alkali-metal ogether in, solution producing a solution of a. chromium compound not precipitatable by alkalis or mordant colors, adding a solution of a mordant color, and evaporatin to dryness.=

e process of I p roducing a com ound of a mordant color so uble in water, a aline water and acidulated water comprising heat in glucose and a neutral chromate of an a all-metal together in solution producing a solutionofa chromium compound not precipitatable by alkalis or mordant colors, add-' ing a solution of a mordant color, adding an I and acidulated water ant color soluble-in water, alka-.

9. The process of producing a com ound of a mordant color soluble in water, al aline water and acidulated water comprising heating glucose and neutral chromate of sodium together in solution producing a solution of a chromium compound not precipitatable by alkalis or mordant colors, addin a solution of a mordant color, adding an al aline com pound and evaporating to dryness.

s a new article of manufacture, a compound of a mordant color soluble in water, alkaline water and acidulated water producible by treating mium compound from the aqueous solution of which the produced chromium compound is not precipitatable by alkalis or mordant colors, and adding a color.

11. As a new article of manufacture, a compound of a mordant color in dry powdered form soluble in water, alkaline water and acidulated water producible by adding neutral chromate of an alkali-metal to a solution of glucose, heating until the aqueous solution of the thus roduced chromium compound is not precipitatable by alkalis or mordant colors, adding a solution of a mordant color, and evaporatin to dryness.

12. As a new article 0 manufacture, a

compound of a mordant color in a dry powdered form soluble in water, alkaline water a neutral chromate of sodium to a solution of glucose,.heatin until the aqueous solution of. the produced 0 romium compound is not precipitatable by alkalis or mordant colors, adding a solution of a mordant color, and evaporating to dryness.

.13. a new article of manufacture, a compound of a mordant color in .dry powdered form soluble in water, alkaline water and acidulated water producible by adding neutral chromate of an alkali-metal to a solution of lucose, heating until the aqueous solution of the thus produced chromium compound is not precipitata'ble by alkalis or mordant colors addln mordant color, adding ana and evaporating to d ness.

4. As a new artic compound of a mordant color in a dry powdered form soluble in water, alkaline water and acidulated water producible by adding a neutral, chromate of sodium to a solution of a solution of a' and evaporating to drykaline compound sis glucose and a chro-- solution of a mordant producible by adding e of manufacture, a

glucose, heatin until the aqueous solution county of Kings, city and State of New of the produce chromium compound is not York, this 25 do of March, 1914:.

precipitatable by alkalis or mordant colors, 1AM BECKERS. adding a solution of a mordant color, add- ISAAC DREYFUS.

5 ing an alkaline compound and evaporating Witnesses:

to dryness. Fnmx Gonsmon,

Signed at the borough of Brooklyn, in the i 7 WM. T. 

